spectroscopy (XPS, Thermo Scientific K-ALPHA) experiments were carried out to analyze the surface chemistry of the samples. N 2 absorption-desorption examinations were performed on ASAP 2020 system. Electrical conductivity measurements were carried out in a ST2258C digital four-probe tester.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.